Hi, I'm new to this game and I'm having the same problem. So it is not due to the e-mail.
In particular, the "Confirm Email" button links to something like (of course I modified it a bit here to not share my personal information) :
https://shop.wurmonline.com/phasetwo?playername=myusername&code=EAgpiQ&email=hereismymail%40gmail.com
When I click on it I get the typical error message ("The requested URL /phasetwo was not found on this server.") that is a sign that their server is down.
Could you please confirm that your problem is exactly like mine?
Is there any game administrator in this forum that could react?
Thanks